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The comparative study of different mixing methods for microcrystalline cellulose/polyethylene composites / Sevda Boran in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 1 (03/2016)
[article]
Titre : The comparative study of different mixing methods for microcrystalline cellulose/polyethylene composites Type de document : texte imprimé Auteurs : Sevda Boran, Auteur ; A. Kiziltas, Auteur ; E. E. Kiziltas, Auteur ; D. J. Gardner, Auteur Année de publication : 2016 Article en page(s) : p. 92-103 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Composites -- Propriétés mécaniques
Composites -- Propriétés thermiques
Composites thermoplastiques
Extrudeuse bi-vis
Extrudeuse monovis
Matières plastiques -- Extrusion:Polymères -- Extrusion
Mélanges-maîtres (chimie)
Morphologie (matériaux)
Polyéthylène
Réaction de couplage
RhéologieIndex. décimale : 668.9 Polymères Résumé : Polymer composites with polyethylene (PE), microcrystalline cellulose (MCC), and coupling agent (PE-g-MA) were melt blended using a single screw extruder (SSE), twin screw extruder (TSE), and a combination of SSE and extensional flow mixer (EFM) and masterbatch method (MB). The rheological behavior, mechanical, thermal, and morphological properties were investigated to compare material behavior of the MCC-filled PE composites and to evaluate the dispersive mixing efficiency. The composite samples prepared using a single pass method in SSE had relatively larger storage moduli (G?) while those from the TSE and SSE + EFM were smaller. The complex viscosities (?*) of composites with processed using EFM was higher than that of neat PE, indicating better dispersion of the MCC.MCC-filled PE composites processed with EFM showed higher tan delta compared to those of composites. In general, MCC-filled PE composites from the EFM process showed higher viscosity compared to all other composites at all shear rates. The EFM method improved flexural properties more than the other processing methods. The effect of EFM on impact strength of the composites was improved with coupling agent. Addition of MCC, couple agent, and different mixing methods did not significantly affect the thermal properties of the MCC-filled PE composites. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PE composites - Testing of the samples
- RESULTS AND DISCUSSIONS : Rheological properties of the samples - Mechanical properties of the samples - Thermal properties of the samples - Morphological properties of the samplesDOI : 10.3139/217.3156 En ligne : https://drive.google.com/file/d/1v16I-UezHHCsQUqgybBgyNKu1YCYVbyR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25774
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 1 (03/2016) . - p. 92-103[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17899 - Périodique Bibliothèque principale Documentaires Disponible The effect of nanosilicates on the performance of polyethylene terephthalate films prepared by twin-screw extrusion / A. Ghanbari in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 4 (2021)
[article]
Titre : The effect of nanosilicates on the performance of polyethylene terephthalate films prepared by twin-screw extrusion Type de document : texte imprimé Auteurs : A. Ghanbari, Auteur ; M.-C. Heuzey, Auteur ; Pierre J. Carreau, Auteur Année de publication : 2021 Article en page(s) : p. 358-366 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Composites -- Propriétés mécaniques
Composites -- Propriétés optiques
Composites -- Propriétés thermiques
Extrudeuse bi-vis
Matières plastiques -- Extrusion
Montmorillonite
Nanoparticules
Polyéthylène téréphtalate
SilicatesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Polyethylene terephthalate (PET) films were prepared by cast extrusion using a twin-screw extruder with a severe screw profile. The effect of an organically modified montmorillonite on thermal, mechanical, optical, and barrier properties of the PET films were investigated. Morphological characterization of the nanocomposite films was performed by employing wide angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) followed by image analysis. The results unfold a mixed morphology for the nanocomposite films with more than 95% exfoliated and intercalated silicate layer structures, depending on the screw rotation speed. The remarkable dispersion of the organoclay particles at the nano-level is discussed in terms of solubility parameter and favorable interactions between PET macromolecules and organic modifier of the nanoclay. The crystal content of the nanocomposite films and their cold and hot crystallization temperatures confirmed the role of silicate nanolayers as a heterogeneous nucleating agent. While all nanocomposite films exhibit higher haze values in comparison to the neat PET samples, incorporation of 2 wt% nanoclay brought about 25% increase in tensile modulus and barrier properties. A range of screw rotation speeds with optimized properties in terms of haze, morphology, thermal, mechanical, and barrier properties is suggested. Note de contenu : - Materials
- Sample preparation
- Characterization
- Table 1 : DSC analysis results of the neat PET and nanocomposite films at various screw rotation speedsDOI : https://doi.org/10.1515/ipp-2020-4044 En ligne : https://drive.google.com/file/d/1UF1Q7xDZbldM1DEaaAvzkMvJsgouDJwq/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36708
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 4 (2021) . - p. 358-366[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23734 - Périodique Bibliothèque principale Documentaires Disponible The effect of silica nanofiller on the physical and thermal characteristics of rubber-based composites / A. Chelli in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 1 (2021)
[article]
Titre : The effect of silica nanofiller on the physical and thermal characteristics of rubber-based composites Type de document : texte imprimé Auteurs : A. Chelli, Auteur ; L. Hemmouche, Auteur ; H. Ait-Sadi, Auteur ; D. Trache, Auteur ; M. Benziane, Auteur ; R. Ait-Sadi, Auteur Année de publication : 2021 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse morphologique
Calorimétrie
Caoutchouc
Caoutchouc nitrile-butadiène
Caractérisation
Composites -- Propriétés mécaniques
Composites -- Propriétés thermiques
Dureté (matériaux)
Essais dynamiques
Formulation (Génie chimique)
Nanoparticules
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 668.4 Plastiques, vinyles Résumé : The use of nano composites in elastomer blends gives outstanding mechanical properties compared to the use of micro and macro composites, even with very low nano filler content. In this paper, we studied the influence of varying proportions of natural rubber (NR) and acrylonitrile butadiene rubber (NBR) reinforced with nano silica on the mechanical and thermal characteristics of the rubber. Mechanical characterizations were carried out with hardness, tensile strength, elongation at break, tear strength, modulus and toughness. For thermal analyses, we used differential scanning calorimetry (DSC) and Thermogravimetric Analysis (TGA). In most cases, the increase in the percentage of NBR with the presence of nano silica enhances hardness, modulus and toughness, however, it reduces tensile strength, tear strength and elongation at break. It was found that nano silica has a catalytic effect on the mixture, and NBR has a catalytic effect on the decomposition of NR. Note de contenu : - EXPERIMENTAL : Materials - Cure characteristics - Mechanical characterization - Morphological analysis - Thermal characterization
- RESULTS AND DISCUSSION : Mechanical properties of the rubber samples - Morphological analysis - Thermal proprieties of the rubber samples
- Table 1 : Compound formulations
- Table 2 : Properties of the rubber vulcanizates
- Table 3 : Temperature of onset of degradation and enthalpy of the samplesDOI : https://doi.org/10.1515/ipp-2020-3956 En ligne : https://drive.google.com/file/d/1e24UlfuwKoYy4IctQbcwb0VcWJfsyiTC/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36347
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 1 (2021)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23731 - Périodique Bibliothèque principale Documentaires Disponible The reinforcement of leather split by constructing an interpenetrating network via in-situ recombination of PVA / Xu Weixing in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 8 (08/2018)
[article]
Titre : The reinforcement of leather split by constructing an interpenetrating network via in-situ recombination of PVA Type de document : texte imprimé Auteurs : Xu Weixing, Auteur ; Hui Zeng, Auteur ; Jianfei Zhou, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 255-263 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites
Composites -- Propriétés mécaniques
Composites -- Propriétés thermiques
Cuirs et peaux
Matériaux -- Renforcement
Polyacétate de vinyle
Polymères -- Propriétés mécaniques
Potentiométrie
Réseaux polymèresIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In order to improve the quality and utilization of leather split, the strength of leather split should be enhanced. The in-situ polymerization of some monomers has proven to be an effective approach in constructing an interpenetrating network (IPN) in split and increasing its strength. But this method is almost unacceptable in practice because of the use of volatile monomers and organic solvents. In this study, a new method to construct the IPN structure in split, in-situ recombination, was developed. Polyvinyl alcohol (PVA) was used as compositing agent, and its molecular structure and modification conditions were optimized. Scanning electron microscope (SEM), potentiometric analyzer and differential scanning calorimeter (DSC) were used to characterize the mechanism of in-situ recombination. The results suggested that PVA with an average polymerization degree of 500 and an average alcoholysis degree of 88% could enhance the strength of split most effectively through compositing reaction of PVA and split in 5% PVA aqueous solution for 120 min under 80°C and pH 7.0. The IPN structure was successfully constructed between PVA and collagen fibers via in-situ recombination. A method to enhance the strengths of leather split with practical application was established. Note de contenu : - EXPERIMENTAL : Materials and equipment - Preparation of PVA/split composites - Measurements and instruments
- RESULTS AND DISCUSSION : Effect of compositing time on mechanical properties of PVA/split composites - Effect of polymerization degree and alcoholysis degree of PVA on mechanical properties of PVA/split composites - Effect of PVA concentration on mechanical properties of PVA/split composites - Morphology analysis of PVA/split composite - Potentiometric analysis of PVA/split composite - Thermal behavior of PVA/split compositeEn ligne : https://drive.google.com/file/d/1k-il4rNBlYeS-mLyrSM8DIC2KCqz1VkM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30842
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 8 (08/2018) . - p. 255-263[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20115 - Périodique Bibliothèque principale Documentaires Disponible